State's passing this law does nothing. Its like the blue states refusing to cooperate with federal agents on immigration. The federal agents still enforce the law in those states, they just don't get state backup or intelligence.

What we need are states to start decriminalizing killing or assaulting federal agents executing unlawful gun control actions within that state. The guy in the Gulag Archipelago said it best. If the jackboots of the tyrannical government have to fear for their lives every time they go to enforce an unjust law, there will be far fewer jackboots.